I have done some more testing and have discovered why you are having problems with this. The pow2 and powfee that you would like to insert into the politem table are not from the repeated selection. Specifying just the values from one of the recordsets will not work since these values are not recorded from the repeat selection.
When using the manage relational table server behavior it is designed only to help you craft a joining table that will hold just the id values to match records from the other two tables.
The type of insert that you are wanting to perform in this page will not be possible with a MRT since you will end up with a table that just holds the id's from these tables. This should be enough to get back any information about a particular item based on the id and the same goes for the pol.
If you would like to add to this other table to with multiple records at once you would need to make use of the DataAssist Multiple insert. Sorry for the earlier confusion on this.